Lock mechanism



NGV. 22, 1932. VM F. KEIL '1,888,954

LOCK MECHANISM y Filed 001;. 19. 1929 fm/66485549 @04:0 ff

Patented Nov. 22, 1932 UNITED STATES OFFICE HENRY KEIL, 0F SCARSDALE, NEW YORK, ASSIGNOR T0 FRANCIS KEIL & SON, INC.,

A CORPORATION OF NEW YORK LOCK MECI-IANISM Application filed October 19, 1929. Serial No. 400,839.

This invention relates to lock construction and more particularly to the construction of the key-operated portions of a lock mechamsm.

One of the objects of this invention is to provide a simple7 practical and rugged keyresponsive lock-operating mechanism that will be of inex ensive construction and reliable action. nother object is to provide a mechanism of the above-mentioned character which will be capable of rapid manufacture, ease of assembly and well adapted to give long continued dependable service. Another object is to provide a mechanism of the abovesmentioned character in which the number of parts may be reduced to a minimum, thus making for greater simplification of construction, less cost of manufacture, and greater reliability of operation. Another object is to provide a key cylinder body and cylinder core construction with associated tumblers that will be of simple construction, made up of individual parts of simple and inexpensive design, and capable of being rapidly and dependably assembled. Another object is to provide a construction for maintaining in assembled relation the rotating` cylinder core, the cylinder body, and the connecting bar, that will be of dependable action, simple and inexpensive construction, and characterized by speed and ease of assembly, all while maintaining the desired precision of relation between the various parts ofthe mechanism. Another object is to provide a mechanism of the abovementioned character that will readily lend itself to quantity production. Other objects will be in part obvious or in part pointed out hereinafter.

rlhe invention accordingly consists in the features of construction, combinations of elements, and arrangement-s of parts as will be exemplified in the structure to be hereinafter described and the scope of the application of which will be indicated in the following claims.

In the accompanying drawing, in which is shown a preferred form of my invention,

Figure 1 is a vertical central sectional view through the assembled key cylinder mechanism, showing the coacting tumblers, as well as the connecting` bar, the bolt or latch mechanism operated by the latter being, however, not shown;

Figure 2 is an end view, as seen from the left of Figure 1, certain parts being broken away and certain parts being shown in section, in order to Abring out more clearly certain features of construction;

. Figure Sis a fragmentary horizontal central sectional view as seen along the line 34-3 of Figure 2, and

Figure 4 is a view partly in section 'along the line 3-8 of Figure 2, showing certain parts in elevation and illustrating the relation between certain of the parts before completion of the assembly.

Similar reference characters refer to similar parts throughout the several views of the drawing.

Referring now more particularly to Fig ures 1 and 2, there is generally indicated at 10 a casing or cylinder housing preferably in the form of a solid casting shaped to provide a substantially cylindrical portion 11 which is bored out as at 12 to rotatably receive the cylinder core or cylinder 13. Extending upwardly from the cylindrical portion 1l and lengthwise thereof is a portion 14, formed integrally with the portion 11, and adapted, as more clearly described below, to house the tumblers, springs and coacting parts. Extending across the right-hand ends of the portions 11 and 14, as viewed in Figure 1, and integrally formed therewith is a circular end plate portion 15 adapted to abut against the outer face of the door 20, or the like, into a suitable opening 21 of which the cylinder housing 10 is adapted to extend.

Suitable ears or laterally extending flanges 16 and 17 (see Fig. 2) are integrally formed with the portions 14 and`11 of the cylinder housing 10 and are provided with appropriate openings 18 and 19, preferably threaded to receive suitable screws 22, the heads of which abut against a peripherally circular plate 23 bridged across the inside or lefthand face (as viewed in Fig. 1) of the door and substantially covering the opening 21 in the latter. The screws 22 securely clamp the door 20 between the plate member 23 and the front end plate portion 15 of the cylinder casing 10, thus securely holding the parts in assembled relation to the door 20.

Any suitable bolt or latch mechanism may be mounted upo-n the left-hand face of the door 20, as viewed in Figure 1, and is operated by rotation of the cylinder 13 through a connecting bar 24 that extends through an opening 25 in the clamping plate 23 and extends into the casing of the latch or bolt mechanism for rotating a suitable Operating member thereof, such as a crank The cylinder core or cylinder 13 is provided with a substantially diametrically extending recess or slot 26 adapted to receive a suitable key; also, the cylinder 13 is provided with a suitable number of radially extending tumbler-receiving recesses shown in Figure 1 illustratively as live in number', as at 27, 28, 29, 30 and 3l. These recesses are in general of a cylindrical shape and extend downwardly into the key-receiving slot 26. The recesses 27 28, 29, 30 and 31, respectively, receive the lower tumblers 32, 33, 34, and 36, of varying lengths, in accordance with whatever key code that the key and mechanism may be designed for.

The portion 14 of the cylinder and tumbler housing 10 is provided with recesses 37, 38, 39, and 41 corresponding in number to the recesses 27 28, etc. in the cylinder 13 and spaced lengthwise of the mechanism exactly as are the recesses in the cylinder 13. rlhe recesses 37, 38, 39, 40 and 41, conveniently formed by drilling into the casting 10, receive upper tumblers 42, 43, 44, and 46, respectively, pressed downwardly by springs 47, 48, 49, and 51, respectively.

With the cylinder 13 in the position shown in Figure 1, the tumbler recesses 27, 28, etc. in the cylinder 13 are in alinement with the tumbler recesses 37, 38, etc. in the portion 14 of the casing 10 and, due to the varying lengths of the lower tumblers 32, 33, etc. the upper tumblers 42, 43, etc., being springpressed downwardly, project out of their respective recesses 37, 38, etc. and into the recesses 27, 28, etc. in the cylinder 13, thus preventing rotation oi the cylinder 13 as well as of the operating connecting` bar 24 which leads to the left and is, as above noted, conneeted to the bolt or latch-operating mechanism mounted on the door.

In order to permit rotation oit the cylinder 13, and hence of the connecting bar 24, a suitable key must be inserted in the slot 26, the key being suitably shaped to litt the upper and lower tumblers throughout such distances that the abutting end faces oit' the upper and lower tumblers are placed in alinement with the interior cylindrical surface of the bore 12 within which the cylinder 13 rotates or, in other words, the coacting` upper and lower tumblers are moved by the key,

against the action of the springs, to such positions that the upper tumblers do not project into the recesses of the lower tumblers and that the lower tumblers do not project into the recesses of the upper tumblers. This, as above noted, is achieved by the use ot the properly shaped key.

In order to achieve the proper assembly of these various parts and maintain such assembly necessary to bring about the intended action, great precision of construction and adjustment has usually been necessary in construction ot lock mechanisms of this character, so much so that the expense of manufacture ot the parts and of their assembly has been relatively high. By means of certain features of my invention, however, l am enabled materially to reduce this expense, as well as to achieve greater ruggedness and dependability of construction., together with many other advantages. ylhe nicety of construction and action necessary will be apparent when it is pointed out that even a slight relative displacement in a direction to the right or left between the casing or housing 10 and the cylinder 13 is sufficient to bring the recesses for the upper and lower tumblers out of alinement, making assembly dhicult or impossible or making the intended operation of the lock mechanism, should such displacement occur during the use of the mechanism, impossible.

l irst counter-bore the end plate portion 15, as at 52, in order to receive the flange 53 of the cylinder or cylinder core 13, the flange abutting against the inner face of the counter'- bore 52. The upper tumbler recesses 37, 38, ete. are properly drilled and spaced with respect to this counter-bored tace 52 while the lower tumbler recesses 27, 28, etc. are properly and substantially similarly spaced with respect to the inner tace of th-e iiange 53 so that when the cylinder 13 is inserted into the casing V10 from the right-hand end thereof, as viewed in Figure l, the abutting of the flange 53 against the counter-bored face 52 insures the proper alinement of the upper and lower tumbler recesses. i This alinement, it is to be noted, should not be disturbed, yet it should be maintained in such a way as not to interfere with ease of rotation of the cylinder 13 under the control of the manually operated key.

The cylinder 13, which is made preferably out of a solid piece ot suitable metal, is provided at its left-hand end, as viewed in Figure 1, with a diametrically xtending slot 54 (see also Figs. 3 and 4) into which the transversely extending end portion 55 of the connecting bar 24 is fitted, as is better shown in Figure 1,this interiittinginsuring that the connecting bar 24 rotates with the cylinder 13. The connecting bar 24 is held in assembled relation to the cylinder 13 by means which also insures the maintenance of the proper alinement between the upper and lower tumbler recesses.

The left-hand end portion of the cylinder 13 is reduced in diameter, as at 56 (see Figs. 3 and 4) and intermediate of the ends of this reduced portion 56 I provide a circumferentially extending groove 57. The flanging of the cylinder 13, as at 53 (Fig. 1), the provision of a suitable diameter throughout its main portion to be freely rotatable within the bore 12 of the housing 10, the reduction in diameter at the portion 56 and the grooving thereof, as at 57 (Fig. 4), willbe seen to include operations which can be readily achieved by turning, as in a lathe or so-called screw machine.

After having inserted the cylinder 13 into the housing and after having inserted the upper and lower tumblers in their respective recesses, together with the springs, the latter in a manner to be more clearly described below, a cap-like member, generally indicated at 58, is slipped over the left-hand end. of the connecting bar 24, the cap member 58 being provided with a slot 59 extending substantially diametrically thereof but of insufficient length to permit the transversely extending lugs of the connecting bar 24 to pass therethrough, and then the cylindrical side portion 60 of the cap member 58 is slipped over the reduced end portion 56 (Fig. 4) of the end of the cylinder 13, it being understood that the right-hand end portions of the connecting bar 24 are housed in the slot 54 of the cylinder 13. y

The cap member 58 is provided with a disklilre laterally projecting flange 61 adapted to overlap the left-hand machined face of the portion 11 of the casting 10; moreover, the length of the reduced portion 56 of the cylinder 13 and the length of the cylindrical side walls of the cap 58 are so proportioned that, when the parts are interlitted as shown in Figure 1, the flange 61 of the cap 58 rests i snugly against the left-hand machined face of the portion 11 of the casing 10 though not so snugly as to interfere with relatively free rotation of the cylinder' with respect to the casting 10.

At a suitable number of preferably diametrically opposed points, preferably two in number, and adjacent the left-hand end thereof, as viewed in Figure 1, the cylindrical portion 11 is cut away, as at 62 and 63 (see Figs. 3 and 4), thus exposing diametrically opposed portions of the cylindrical side part 60 of the cap 58. I thereupon press or force the metal of the cylindrical part 60 of the cap 58 inwardly into the groove 57, as is indicated at 64 and 65 in Figure 3 (see, also Fig. 2). Preferably I press these portions of the parts 60 inwardly by means of a suitable hand press, provided with a suitable anvil and a suitable die.

rThus, the cap 58, positioned as above described, is dependably held in assembled relation with respect to the cylinder 13 and in turn it dependably holds the latter in assembled relation with respect to the housing 10 and at the same time holds the connecting bar 24 assembled to the cylinder 13, all without interfering with the necessary freedom of rotary movement of the cylinder and without permitting such relative displacement between the cylinder 13 and its housing 10` as will interfere with the proper coaction of the upper and lower tumblers with each other and with their respective tumbler recesses.

Considering now the assembly of the tumblers and their related springs, this, as above noted, I prefer to achieve before the cap member 58 is secured in place. It might at this point be noted that the tumblers and springs are relatively minute parts and are three in number for each pair of tumbler recesses. rIhus, in the illustrated mechanism of Figure 1, there are five lower tumblers, live upper tumblers, and five springs, making fifteenminute parts in all. These numerous small parts are relatively difficult to handle and, according to prior practice, their handling and assembly constitutes a laborious and time-consuming operation. I am enabled, however, by means of certain coacting features of my invention, greatly to facilitate the assembly of these and related parts, and minimize the cost of material necessary and the cost of production.

After alining the lower tumbler recesses 27, 28, etc. with the upper tumbler recesses 37, 38, etc., as by rotating the lcylinder into proper position, I drop the lower tumblers 32, 33, etc., into their respective recesses and follow these lower tumblers by the upper tumblers 42', 43, etc., whence the springs 47, 48, etc., respectively, are inserted in the upper portions of the tumbler recesses 37, 38, etc., respectively. The upper face of the tumblerreceiving portion 14 of the casing 10 is planefaced and may, if desired, be machined. 'I he upper portions of a suitable number of upper tumbler recesses, illustratively the upper portions of the two end recesses 37 and 41, are counter-bored throughout an appropriate length, as at 66 and 67 (Fig. 1). This counter-boring at 66 and 67 is preferably of such a diameter that two cartridge-like members 68 and 69 can be forced into these counterbores and securely held frictionally therein. These cartridge-like members 68 and 69 are closed at their upper ends and are of an in side diameter, preferably similar to the diameter of the upper tumbler-.receiving recesses. Also, the upper ends thereof are flanged, all as is clearly shown in Figure 1.

I then provide a plate member 7 0 of sufficient expanse to cover the upper face of the tumbler-receiving portion 14 of the housing 10, this plate member 70 being provided with openings 71 and 72 through which the cartridges 68 and 69 fit. Moreover, the openings 7l and 7 2 are spaced sufficiently so that, when the plate member 70, with the cartridges 71 and 72 etending therethrough, is moved downwardly, as viewed in Figure 1, the projecting springs 47 and 51 enter the cartridges, the cartridges enter the counter-bores66 and 67, respectively, and as the cartridges are forced into the counter-bores, the projecting intermediate springs 48, 49 and 5l, abutting against the under-face of the plate 70, are compressed. rFlie parts 68 and 69 are forced downwardly to a sufficient extent to carry the plate snugly against the upper face of the portion 14 of the housing 10, whence the intermediate springs 88, 89 and 40 and related tumblers are dependably secured in their recesses, while the upper closed ends of the cartridges 68 and 69 securely hold the springs and 51 and their associated tumblers against egress.

Thus, a single downward movement` of the parts 68, 70 and 69 serves to operate upon all of the projecting springs simultaneously, making it unnecessary to manipulate the springs individually, as has been the case in prior practice.

l may also drill a hole 7 3 through the plate member 70 and into the portion 14 of the casing 10 and force into the metal of the portion 14 the flutes 74 of a securing member made of a suitable met-al with respect to the metal of the yportion 14 so that the flutes 74 cut their way into the metal of the part 14. For example, the member 7 5 may be of steel and the flutes 74 thereof hardened so that they cut their way into the relatively softer metal, which 'may be brass, or the like, of the portion 14. The flutes 74 are, shown inFigure 1, of relatively great pitch so that the hole 73 need not be tapped or otherwise prepared for the reception of the fluted member 75.

lt is to be understood that I may fasten the spring and tumbler-retaining plate 70 in place either by such device as the members 68 and 69 alone, or by such devices as the flute-d member 75 alone, or by the use of both, as in the preferred form. In any of these cases I achieve many advantages over prior practice, among which may be noted that elaborate machining, or tapping, or threading of parts, is avoided. It is further to be understood that l achieve distinct and different advantages where l use such devices as the cartridges 68 and 69 alone `and that l may achieve still other advantages by using fluted members, like the member 75, alone.

The members 68 and 69 are preferably made of a relatively elastic metal, such as a suitable brass, and are conveniently made of sheet metal. rFhe counter-bores 66 and 67 are of a diameter sufficiently less than the outside diameter of the tube-like portions of the cartridges 68 and 69 so that the latter may be force-fitted into the former, straining the tubular portions of the cartridges in such a manner that their tendency to regain their original diameter assists in maintaining a tight frictional interlocking engagement with the walls of the counter-bores 66 and 67.

Should it be desired to remove the plate member 70, the latter' may be pried off, the frictional engagement of the flutes 74 of the member 7'5 and the tight frictional interf locking engagement between the cartridges and the counter-bores yielding sufciently to permit the removal ofthe plate member 70.

Before replacing the parts, the tubular or with the walls of the groove 57 (Fig. 4) may,

be achieved. This frictional engagement is preferably such as to prevent rotation of the cap member 58 relative to the cylinder 13 and also to prevent relative play between these two parts in an axial direction. rlhe connecting bar 24 extends through the rectangular slot 59 in the end wall of the cap 58 but it preferably, also, extends into the slot 54 in the cylinder 13 (see Figs. 3 and 2) so that the turning force applied to the connecting bar 24 is transmitted directly by the cylinder 18 rather than through the cap 58. rlhus, also, disturbance of the desired relation between the cap 58 and the cylinder 13 is avoided.

lt will thus be seen that there has been provided in this invention a construction in which the various objects hereinabove de scribed, together with many thoroughly practical advantages, are successfully achieved. rlhe various parts of the mechanism will be seen to be of Xceedingly simple construction and yet facilitate assembly of these minute and relatively precise parts in a highly eX- peditious and advantageous manner. l am enabled to cut down materially intricate machine tool operations, and am enabled to confine what machining is necessary to relatively simple and inexpensive operations. Moreover, it will be seen that such parts as the cap member 58 are constructed to be capable of manufacture by automatic machinery while the cartridges 68 and 69, which may take the form of so-called eyelets having one end closed are again of a character as to permit their rapid and inexpensive manufacture on a large scale. The resultant mechanism, moreover, will be seen to be well adapted to meet the varying conditions of hard practical use.

As ymany possible embodiments may beY madekof the above invention and as many changes `might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense.

I claim:

1. In lock construction, in combination, a key-receiving cylinder, a casing rotatably mountingsaid cylinder, said casing and said cylinder being dimensioned at their rear ends to provide an annular space therebetween, tumbler means for coaction with a key for controlling the rotation of said cylinder, a connecting bar for actuation by said cylinder, said cylinder having a transverse slot at its rear end for receiving` said bar and having a peripherally extending groove adjacent its :rear end, and a cap-like member fitted over the rear end of-said cylinder and having said bar projecting therethrough, said cap-like member having portions thereof pressed inwardly into said groove and the side wall )portions of said cap-like member being received within said annular space.

2. In lock construction, in combination, a key-receiving cylinder, a casing rotatably mounting said cylinder, tumbler means for v'coaction with a key for controlling the rotation of said cylinder, said cylinder having a flange at its one end for abutting against the one end of said casing and having its vother end portion reduced in diameter to provide an annular recess open from said other end of said cylinder, said reduced end portion having a groove therein, a sleeve-like member fitted over said reduced end portion Yand received within said annular recess and having a part thereof 'pressed into said groove, said sleeve-like member having a flange adapted to abut against an end face of said casing, and a connecting bar actuated by said cylinder.

3. In lock construction, in combination, a key-receiving cylinder member flanged at its forward end, a casing member having a cylindrical bore for rotatably housing said cylinder member, said members having tumbler "means for coaction with a key in controlling the rotation of said cylinder member and said flange abutting against a front portion of said casing member and one of said members being shaped adjacent its rear end to provide an annular space between said two members, and a sleeve-like member fitted into said annular space and secured to said cylinder member and having a flange overlap'- ping the rear end of said casing member.

4. In lock construction, in combination, a key-receiving cylinder member flanged at its forward end, a casing member having a cylindrical bore for rotatably housing said cylinder member, said members having tumbler means for coaction with a key in controlling the rotation of said cylinder member and said flange abutting against a front portion of said casing member and one of said members being shaped adjacent its rear end to provide an annular space between said two members, a sleeve-like member extending into said annular space and having a flange for abutting against the rear face of said casing member, said cylinder member having a recess underneath said sleeve-like member, and means projecting inwardly from said sleeve-like member and into said recess in said cylinder member.

5.y In lock construction, in combination, a key-receiving cylinder member flanged at its forward end, a casing member having a cylindrical bore for rotatably housing said cylinder member, said members having tumbler means for coaction'with a key in controlling the rotation of said cylinder member and said flange abutting against a front portion of said casing member and one of said members being shaped adjacent its rear end to provide an annular space between said two members, a ring member fitted into said annular space, a connecting bar, means forming a connection between said connecting bar and said ring member, and means for securing said ring memberto said cylinder member, said ring member having means for preventing movement of said cylinder member relative to said casing member in a direction toward said flange. Y

6. In lock construction, in combination, a key-receiving cylinder member flanged at its forward end, a casing member having a cylindrical bore for rotatably housing said cylinder member, said members having tumbler means for coaction with a key in controlling the rotation of said cylinder member and said sov flange abutting against a front portion 0f said casing member and one of said members being shaped adjacent its rear end to provide an annular space between said two members,

a ring member fitted into said annular space, a connecting bar, means forming a connection between said connecting bar and said ring member, said cylinder member being provided with a recess adjacent said ring member, means projecting inwardly from of said casing member and one of said members being shaped adjacent its rea-r end to provide an annular space between said two members, a ring member extending into said annular space and secured to said cylinder member for coaction with said iange in prelindrical bore for rotatably7 housing said cylinder `member, said members having tumbler means for coaction with a key in controlling the rotation of said cylinder member and said iiange abutting against a front portion of said casing member and one of said members being shaped adjacent its rear end to provide an annular space between said two members, a sleeve-like member extending into said annular space, said cylinder having a groove underneath said sleeve-like member and said sleeve-like member having a portion thereof passed inwardly into said groove, said casing being cut away to permit said portion of said sleeve-like member to be pressed to said groove.

9. In lock construction, in combination, a key-receiving cylinder member flanged at its forward end, a casing member having a cylindrical bore for rotatably housing said cylinder member, said members having tumbler means for coaction with a key in controlling the rotation of said cylinder member and said flange abutting against a front portion of said casing member and one of said members being shaped adjacent its rear end to provide an annular space between said two members, and a sleeve extending into said annular space, said cylinder member having a peripherally extending grove substantially underneath said sleeve and portions of said sleeve being forced into said peripheral groove, said casing member being cut away at at least two substantially diametrically opposed points to permit said portions of the sleeve to bepressed into said peripherally extending groove.

l0. In lock construction, in combination, a key-receiving cylinder, a casing, said cylinder and casing having recesses each adapted to receive a lower and an upper tumbler and a spring, said tumblers operating normally to hold said cylinder against rotation relative to said casing and against relative axial movement therebetween, a member for holding said spring and tumblers in said recesses, a member for holding said cylinder in assembled relation to said casing and for maintaining proper alinement of said recesses, and means for holding one of said members in position and including a device force-fitted into a recess in the part by which said one member is carried.

11. In lock construction, in combination, a key-receiving cylinder, a casing, said cylinder and casing having recesses each adapted to receive a lower and an upper tumbler and a spring, said tumblers operating normally to hold said cylinder against rotation relative to said casing and against relative axial movement therebetween, a member for holding said spring and tumblers in said recesses, a member for holding said cylinder in assembled relation to said casing` and for maintaining proper alinement of said recesses, and means for holding one of said members in position and including a member of yieldable metal forced into frictional interlocking engagement with the part by which said onemember is carried.v

12. In lock construction, in combination, a key-receiving cylinder, a casing, said cylinder and casing having recesses each adapted to receive a lower and an upper tumbler and a spring, said tumblers operating normally to hold said cylinder against rotation relative to said casing and against relative axial movement therebetween a member for holding said spring and tumblers in said recesses, a member for holding said cylinder in assembled relation to said casing and for maintaining proper alinement of said recesses, and means for holding one of said members in position and including a sheet metal member strained into interlocking frictional engagement with the part by which said one member is carried.

18. In lock construction, in combination, a key-receiving cylinder member, a casing member rotatably carrying said cylinder member, said members having recesses for the reception of tumblers and a spring for coaction with a lrey in controlling the rotation of said cylinder member, said tumblers operating normally to hold said cylinder member against rotation relative to said casing member and against relative axial vmovement therebetween, a device carried by said casing member for closing the recess therein which houses said spring and tumbler, a connecting bar, a device carried by said cylinder member for holding said connecting bar in assembled relation to said cylinder member and for holding said cylinder member against axial displacement relative to said casing member and for thus preventing disalinement of the recesses therein, and means force-fitted into a recess in one of said members for securing the device carried by it thereto.

14:. In lock construction, in combination, a key-receiving cylinder member, a casing member rotatably carrying said cylinder member, said members having recesses for the reception of tumblers and a spring for coaction with a key in controlling the rotation of said cylinder member, said tumblers operating normally to hold said cylinder member against rotation relative to said casing member and against relative axial movement therebetween, a device carried by said casing CII.

member for closing the recess therein which houses said spring and tumbler, a connecting bar, a device carried by said cylinder member for holding said connecting bar in assembled relation to said cylinder member and for holding said cylinder member against aXial displacement relative to said casing member and for thus preventing disalinement of the recesses therein, and means for securing one of said devices to the member by which it is carried, said means including a sheet metal member forced into frictional engagement With a portion of said one member.

15. ln lock construction, in combination, a key-receiving cylinder, a casing for rotatably supporting said cylinder, said cylinder and ksaid casing having tumbler means for coaction With a key, said cylinder having a portion of reduced diameter, thereby to form an annular space between said casing and said cylinder, and means assisting in holding said cylinder in assembled relation to said casing Vand including a sheet metal member fitted over said reduced portion of said cylinder, said portion having a groove and said sheet metal member having a portion forced into said groove.

16. In lock construction, in combination, a key-receiving cylinder, a casing for rotatably supporting said cylinder, said cylinder and said casing having tumbler means for coaction with a key, a connecting rod for actuation by said cylinder, said casing and said cylinder being shaped to provide a recess therebetween open from one end thereof, and means for holding said cylinder, said casing and said connecting rod in assembled relation, said means including a member iitted over an end portion of said cylinder and received Within said recess and having a part thereof projecting into a groove in .said cylinder.

ln testimony whereof, l have signed my name to this specification this 14th day of October, 1929.

HENRY F. KEIL. 

